Just thought this might be a good idea, instead of upgrading to a FD3S 100 amp alternator.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT

 

I think you'll be better off taking your alternator to a alternator shop and having yours made to spec. It will most likely be way cheapter, this is what i'm planning to do soon and hopefully get it at around 150A